Metal stair.



c. F; STEIBER. METAL sum.

APPLICATION FILED OUT. 17, 1908.

Patented Apr. 27, 19.09.

' INVEN TOR Charles Ffiie A'rns HFEQE.

cnARLEs rantnnion srniena ornaw YORK, N. Y.

METAL swam.

- neqeiaree.

To all whom it md/jconcern:

Be it known that I, CnARLns FRIEDRICH STEIBER, a citizen of the United States, and a resident of the city of New-York, borough of the Bronx,'in the county and State of New York, have invented new and Improved Metal Stairs, of which the following is a full, clear, and exact description,

This invention relates to stairs or stain cases, and especially to staircases which are formed of metal. g

The object of the invention is to produce a staircase which is especially adapted to be formed of steel or similar materia invention relates especially toth'e form of the separate parts and the manner inwhich the stairs are built up therefrom. i

The invention consists in the construction and combination of parts to be more fully described hereinafter and particularly setforth in the claims.

Reference is tobe had to theaccompany- .ing drawingsforming a, part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure ,1 1s a vert1c'al cross section on the line 11 of'Fig. 2, through the step'sf'illustrating the simplest form of the construction, a portion of one of the side stringers being shown; Fig. 2 is a plan of oneof the steps, showing one'of the risers and the side stringers in cross section, themiddle portion of this view being broken away; Fig. 3 is a section on the line 3- 3 of Fig. '1, illustrating the manner of attaching the tread tothe side stringers; Fig. 4 is a View similar to Fig.1 1, showing the preferred form of construction of the treads of the staircase; andFig.v 5 is a section taken on the line 5-5 ofl Fig. 4, and further illustrating the construction of the tread.

Referring mpre' articularly to the parts, and especially to ig. 1, 1 represents a side stringer, two. or more of which are used in building the staircase, To these side stringers, horizontal gain cleats or gains2 are attached, the same consisting simply of angle cleats having horizontal flanges 3 and Webs 4 which are attached to the stringers' by rivets 7 Specification of Letters Patent.

; Application fil ed October 17, 1908. Serial No. $58,214.

and the Patented April 27, 1 909.

a miter joint -7, as indicated. To the flanges 8 of the riser cleats, risers 9 are attached by -I'1VQtS 10. These risers'are' formed of light shown, that is,

anal at the lower tal'flan-ge 11 is formed. .of the Web of.eaa$lf riser, an upwardly projectin nose 12- is formed. The upper portion 0 this nose 12 is extended rearwardlyandofi'set downwardly so as to form a seat flange 13. These-flanges 13 are provided at suitablepoints-throughout with slots 14; similar slots are provided in the fiangesll at the foot of each riser. The tread 15 ofthe step is formed of a metal plate, the middle portion of which isornamented and stiffened by lon itudinal ribs or gutters lfiwhich, are press'e into the ma terial, as shown. 7 The ends-of this plate rest on the flanges 3- of the aim cleats, and are provided with slots 17 which are attached to the flanges 3 by bolts 18 res ectively,,as. indicated. Thelongitudinale g'esof thetreads 15 areprovided with integral downwardly projecting ears 19 which register with the slots 14'. I'n-assemblin the'staircase-these ears are seated in the s ots 14, and crimped on the under side, as indicated in Fig. 1. -In thisway the treads are securely attached to the risers and ain,cleats. I referthe slots they present verticahwebs,

At the upper edge simple bolt openings, because this insures that a perfect alinement at this point-will take place when the treads are seated. The

ing narrow flanges, as shown.

The constructionv described produces a very light and neat staircase having a light tread.

having aheavier tread, I

'employ.the construction shown in Figs-4 and .5. In this riser is extended forwardly above the tread each riser 18 provided with a flange 25, simi- ==lar to the flangell in the form illustrated in steel which is stamped or pressed to the form the length thereof side stringers may be made ofehannels hav form of the invention the web -19 of each abut the outer ends of the'gains so as to form en-a of each web, a hor'izon- 17'at the en sof the trea s rather than- Where itisdesired to produce a staircase 20, and formed into a roundedmose 21-hav-' r Fig. 1. The inner longitudinal edges of the tread 20 are provided with ears 26 which are attached to the flange 25, in the same manner as that illustrated in Fig. 1. On the inner faces of the side stringers, deep channel irons or side irons 27 are attached, as indicated in Fig.- 5, the webs of the channels being disposed against the stringers. The lower flanges 28 of the side irons are bolted to the metal tread 20, and the flanges oi the cleats 24. In this way side pockets are formed under the upper flanges 29 of/the side irons. In all other respects the metal part of the staircase is constructed identical with the staircase shown in Fig. 1. I then fill the space over the metal tread 20 with a filler or composition tread 30. This filler may be formed of concrete, asphalt, or any other suitable material. It completely fills the space directly over the metal tread, the upper face of the filler being iinishedofl flush with the upper faces of the flanges 29 and the upper edge of the nose 21. Asindicated in Figs. 4 and 5, the material of the filler 30 extends into the cavity of the nose 21 and into the pockets formed under the flanges 29,.so

that the filler is securely rc tained in position.

Having thus described my invention, I claim as new and desire to secure by Letters Patent,

1. A staircase having risers presenting flanges, said flanges having openings, therein, and treads supported on said flanges and having integra ears projecting through said openings and clenched on the underside of said flanges.

2. A staircase having side stringers, risers connecting said side stringers, having noses formed at the upper edges thereof, and treads secured to said risers, said risers having open ings, said treads having integral ears projecting down through said openings and clenched thereto.

3. A staircase having side stringers, risers connecting the same and having flanges at the lower edges, metal treads having ears, said flanges having openings receiving said ears, said treads being riveted tosaid risers at the outer edges thereof, said risers having noses projecting above said metal treads to retain a filler, and. side irons at the inner sides of said stringers forming pockets to receive the filler. I

In testimony whereof I have signed .my

name to this specification in the presence of two subscribing witnesses. CHARLES FRIEDRICH STEIBER.

Witnesses:

EDWARD SCHOPPE, PETER IMIIOF. 

